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The #14 is the largest standard commercial letter envelope in the U.S. numbering system. At 5 x 11 1/2 inches, it's three quarters of an inch taller and two inches wider than a #10, which puts it in a different operational category entirely. A #10 holds a letter sheet folded into thirds. A #14 holds a legal-size 8.5 x 14 sheet folded into thirds, a thick multi-page correspondence packet that would make a #10 or even a #12 look strained, or anything where the combination of content volume and document size has been working around the limits of a smaller envelope. Still qualifies for USPS First-Class letter-rate postage at 5 inches tall. Available blank or with custom logo and return address printing from Business Envelopes. Free shipping, no minimums.
The 4 3/4 x 11 1/4 inch interior is the key figure. Here's what that space accommodates:
The #12 at 4 3/4 x 11 inches is the size that fills the gap between the #10 and the #14. It handles thick multi-page correspondence that strains a #10. But legal-size sheets folded into thirds push the #12 closer to its comfortable limit than most buyers realize until the fold compresses the document at the crease line. The #14 at 5 x 11 1/2 inches gives legal-size correspondence the same comfortable clearance that standard-size correspondence gets in a #10. The extra half inch of width above the #12 is what produces that result.
Law firms, insurance carriers, real estate offices, and financial institutions use the #14 as their standard outgoing envelope specifically because their correspondence mix regularly includes legal-size documents. It's not a specialty size for those organizations. It's the default. The #14 also qualifies for First-Class letter-rate postage at 5 inches tall, which keeps per-piece postage the same as a #10 on contents under 3.5 oz. For thick correspondence, that's the size that handles the content load without triggering flat-mail postage rates.
For the same #14 size with a single window for displayed-address correspondence, see the #14 White Window Gum Flap. For the step down to the #12 for slightly lighter correspondence, see the #12 White Gum Flap. For the standard #10 in plain white wove, see the #10 White Gum Flap. Browse the complete regular envelope range for all commercial letter sizes.
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